Use After Free
A heap-use-after-free in the av_freep function in libavutil/mem.c of FFmpeg before 4.4 allows attackers to execute arbitrary code.
CWE-416 - Use After Free
Use-after-free (UaF) vulnerability occurs when the application is using a pointer to memory that has been freed. Any attempt to read/write to a buffer after it is de-allocated allows memory corruption, sensitive information exposure, and can potentially lead to arbitrary code execution.